LifePenis worms had hermit crab-like defence system 530 million years ago More than half a billion years ago, tiny penis worms had learned to protect themselves by grabbing and living inside snail-like shells, like hermit crabs do today News
LifeHow our ape ancestors suddenly lost their tails 25 million years ago Why don't humans have tails? A comparison of the genomes of apes and monkeys has revealed the mutation that caused the ancestors of apes to lose these appendages, a change that did not happen gradually but all at once News